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839 Views 3 Replies Last post: Nov 8, 2012 5:09 PM by WYY RSS
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Oct 15, 2012 8:56 PM

Snowdonia lichens....

Hi, found these lovely lichens on rocks on the road to Llanberis, can anyone ID them please?lich_MG_5587.jpglichen_MG_5565.jpg

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    Nov 8, 2012 1:36 PM (in response to WYY)
    Re: Snowdonia lichens....

    I have pointed one of our lichen experts in the direction of these and he comments:

     

    The yellow one is a Rhizocarpon species of the R. geographicum group, a species complex with several taxa which often require microscopic characters for exact identification. What they all have in common is that they are light loving species from rather acidic rocks – many of them are pioneers which colonize rocks rather quickly but once established they can stay for very long periods – up to hundreds of years and they are used in the so-called lichenometry for dating of glacial moraines or monuments (based on “calibrated” thalli eg. from nearby graveyards with dated tombstone the average annual growthrate is calculated and using this data the age of the moraine, monument or whatever is the object of interest is estimated.).

     

    The pink one is tricky for me and would need microscopic characters to get it identified. This is the case for many lichens with a crustose growth type – some of them can be identified in the field or by checking a good macro-image, but often you do need to study microscopic characters to identify crustose lichens properly.

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